PARTICLE-SIZE EFFECTS ON OPTICAL TRANSPORT THROUGH STRONGLY SCATTERING MEDIA

Measurements of transmission and enhanced backscattering from powder b eds of alpha-Al2O3 consisting of particles with different average size s are reported. The values of the mean free path and the absorption le ngth, as inferred from these measurements, are compared and good agree ment between the two measurements is found when the internal reflectio ns are properly taken into account. A particle size measurement method is suggested on the basis of the linear dependence found experimental ly between the transport mean free path and the mean particle size.